Those white plastic clips are almost FROG only supply and as Paul says they are for the chrome surround trim of the tub of the Brumby. The round one is specific for the first screw to the left and right of the gate, under the corner piece of chrome trim.

Look, they even come with a rubber gasket for snug fit. Average cost about two bucks each

__________________King Hit, One Punch, Cowards Punch - call it a PRISON Punch to get the message across !!

These are the clips to hold the chrome strips around the tray (and tailgate) area on.

Tonneau cover clips and straps are available from Clark Rubber.

Ah.

All my chrome is held on by screws, and nothing more...

I suppose this is why I didn't recognize them.

I mentioned the tonneau because I'm looking for ways to get the round clips mounted on the car that the straps connect too added too for the new tonneau, and to repair the current ones.
The round one's (or some like them) are what I'd use to affix the rest of them when I attach some push studs for the new tonneau cover.